Quantum spin liquids (QSLs) are exotic phases of matter which exhibit long-range entanglements but no traditional symmetry-breaking orders even at extremely low temperatures.[1]}, [2]} The strong quantum fluctuations in systems with geometric frustrations or frustrating interactions causes the melting of long-range magnetic orders, resulting in disordered quantum state without breaking of spin and lattice symmetries. The elementary excitations in a gapped QSL obey fractional statistical and have potential applications in quantum computations[3]}, [2]}. Therefore the realization of QSLs has attracted lots of interest in condensed matter physics. Theoretical studies indicate that QSLs generally result from the competition of different magnetic orders[5]}, [6]}, [7]}. Experimentally, candidate QSL materials have been reported on various lattice structures, including triangular lattice, kagome lattice and even three dimensional magnets[8]}, [9]}, [10]}, [11]}.
